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How to declare and initialize a dictionary in C#?
Dictionary is a collection of keys and values in C#. Dictionary is included in the System.Collection.Generics namespace.
To declare and initialize a Dictionary −
IDictionary d = new Dictionary();
Above, types of key and value are set while declaring a dictionary object. An int is a type of key and string is a type of value. Both will get stored in a dictionary object named d.
Let us now see an example −
Example
using System; using System.Collections.Generic; public class Demo { public static void Main() { IDictionary<int, int> d = new Dictionary<int, int>(); d.Add(1,97); d.Add(2,89); d.Add(3,77); d.Add(4,88); // Dictionary elements Console.WriteLine("Dictionary elements: "+d.Count); } }
Output
Dictionary elements: 4
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